PLEASE NOTE: For Key Capital Projects, please visit Key Capital Projects.

 Vendor Registration with PlanetBids

Thank you for your interest in doing business with Delta Diablo. To ensure a fair and efficient procurement process, we partner with PlanetBids to manage our vendor registration, bid opportunities, and contract notifications. 

We invite all vendors interested in providing goods and services to register through our PlanetBids Vendor Portal.  Registration is free and only takes a few minutes.

Why Register?

    •    Access current and upcoming bid opportunities

    •    Receive notifications tailored to your business category

    •    Submit bids and proposals electronically

    •    Keep your business profile and contact information up to date

How to Register:

    1.    Visit our PlanetBids Vendor Portal

    2.    Click on “New Vendor Registration”

    3.    Complete your company profile and select relevant categories

    4.    Save your information and start exploring opportunities!

If you are already a registered vendor, please ensure your profile is current to avoid missing any updates or bid notifications.

For assistance with the registration process, please email our Administrative staff.

We look forward to partnering with you!
 

Secondary Process Improvements

The Secondary Process Improvements Project has been implemented to address aging infrastructure at the wastewater treatment plant, add secondary treatment capacity for population growth in the service area, and to incorporate advanced nutrient removal technologies into the plant processes. The project is strategically divided into two phases to ensure expeditious completion of near-term facility needs while allowing time to better align the overall project goals with the emerging nutrient removal regulations being developed over the next five years. The initial phase will focus on decommissioning the aging trickling tower filters and construct additional aeration basins to ensure reliable secondary treatment. To support these improvements, ancillary facilities including a secondary clarifier, blower building and pumping stations are also to be constructed. These facilities not only support the Phase 1 infrastructure but are designed to seamlessly integrate with the nutrient removal facilities planned for the future expansion. The second phase of construction will include additional deep well aeration basins and the repurposing of the existing aeration basins to optimize their functionality within the nutrient removal processes.

Notice of Request for Proposals

Construction Management and Inspection Services – Secondary Process Improvements Phase 1 Project

Posted: July 10, 2025

Delta Diablo is seeking proposals from qualified firms to provide construction management and inspection services for Secondary Process Improvements Phase 1 Project at its Wastewater Treatment Plant in Antioch, California. The project includes the construction of new aeration basins and clarifiers, major structural and electrical improvements, and infrastructure to support future nutrient removal.

The selected firm will provide full-time on-site construction management support, including contract administration, inspection, scheduling oversight, coordination of process tie-ins and outages, change management, startup and commissioning support, and CEQA mitigation monitoring.

The full RFP, including submission requirements, project scope, and reference documents, is available at the link below:

https://vendors.planetbids.com/portal/72798/portal-home

Proposal Due Date: August 7, 2025, at 2:00 PM PDT

Non-Mandatory Pre-Proposal Meeting: July 22, 2025, at 2:00 PM (In-person and virtual)

For more information, contact the District via https://vendors.planetbids.com/portal/72798/portal-home

CEQA Initial Study/Mitigated Negative Declaration

The District has completed environmental review for the project in accordance with California Environmental Quality Act (CEQA). The Initial Study/Mitigated Negative Declaration (IS/MND) and related project information are available at the State Clearinghouse website: https://ceqanet.lci.ca.gov/2024080857

Point of Contact:  Sean Williams, Associate Engineer, seanw@deltadiablo.org 

Project Status: Design

Anticipated Start of Construction: Spring 2026

Estimated Construction Cost: $80M-$115M